Static addresses in your carrier assigned public range are actually very similar to static ULA in terms of what happens with multiple carriers. The same is even

Static addresses in your carrier assigned public range are actually very similar to static ULA in terms of what happens with multiple carriers. The same is even somewhat true for moving carriers unless you specifically want to talk to that exact /64 again. That said I'd still recommend cleaning them up in such an event as the main advantage of utilizing the public addresses is things like your DNS servers can be exposed to the internet without the need of NAT. To me that's a lot more the "right solution" than making trade offs for fear of re-iping your devices for the times in your life you change carriers. Multiple carriers has no (consumer level) solution I've found myself happy with. It's anywhere from "hope all your devices handle multiple public prefixes quickly and without errors" to "NAT and deal with the pain you had from v4 again" to "Use some other way to relay or host your static services which need to be externally accessible" to "go back to dealing with trying to automatically update that DNS server entry on and making sure it always stays consistent"